KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89930
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:02 UTC
Updated2026-09-16 15:18:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Service local TLB flushes on failed nested VM-Enter KVM services local TLB flushes on "full" nested VM-Exits (through __nested_vmx_vmexit()), but not if a nested VM-Enter fails (e.g. due to failed VMCS checks in nested_vmx_enter_non_root_mode()). However, it is possible that KVM had queued TLB flushes that need to be performed, even if the nested VM-Enter was not successful. For example, if VPID is disabled for L2 (via nested_vmx_transition_tlb_flush(), or if via the MSR load lists, as the SDM says: If any MSR is being loaded in such a way that would architecturally require a TLB flush, the TLBs are updated so that, after VM entry, the logical processor will not use any translations that were cached before the transition. The SDM is unclear about when the TLB flush should occur, and whether or not a failed VM entry would flush the TLB, so it is safer to always do the TLB flush in this case. More concretely, KVM also updates the last VPID L1 used for L2 in nested_vmx_transition_tlb_flush() (i.e. last_vpid), even if the VM entry ultimately fails. With the current code, KVM could miss a TLB flush if L1 changes L2's VPID, then does a failed VM entry followed by a successful one, as the failed VM entry would update last_vpid but not actually flush the TLB. Servicing local TLB flushes on failed VM entries makes sure that the TLB is always flushed when last_vpid is updated.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.3CRITICALCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 c0c66cd575e31218da6a7d104c6ef80b0830b60c git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 1025b938dc439b75c720a568a855a13eeb245686 git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 312cdb6d8940827dea63a7a52fb714a5049f06d1 git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 f74fccdf4f7fb0780cd84944108d35f3d9dc46a7 git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 c43563e7518e65ec6ccaa6a65f84c5af5ca5d379 git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 62c3ee4c9f0e2efef5157358b3549e50ede96d73 git Not specified
CNA Linux Linux affected 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 05a0b701d1089fb57beeb8982f23c3bbafe0fa8b git Not specified
CNA Linux Linux affected 4.4 Not specified
CNA Linux Linux unaffected 4.4 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/62c3ee4c9f0e2efef5157358b3549e50ede96d73 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0c66cd575e31218da6a7d104c6ef80b0830b60c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/312cdb6d8940827dea63a7a52fb714a5049f06d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/05a0b701d1089fb57beeb8982f23c3bbafe0fa8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1025b938dc439b75c720a568a855a13eeb245686 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f74fccdf4f7fb0780cd84944108d35f3d9dc46a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c43563e7518e65ec6ccaa6a65f84c5af5ca5d379 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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